license to access Planner Premium from Power Apps

We want to create a Power Apps that connect to those main sources:-

1) SharePoint

2) Premium Planner

now i know that connects Power Apps to Premium Planner will make the Power Apps as premium app, and users will need premium power apps license to access it. and also accessing Premium Planner will need atleast Planner Plan1. so what is the minimum license for those 3 groups of users:-

1) normal users will be accessing SharePoint lists only through the Power Apps

2) Admin users will be accessing SharePoint lists and Premium Planner through the Power Apps + Premium Planner through the Premium Planner UI.

3) Senior user will be accessing SharePoint lists and Premium Planner through the Power Apps only.

does Planner Plan1 is enough for Senior user? and does Power Apps Premium is enough for admins?

Thanks